Topaz — Topaz Dome Quarry

Sun shading (lidar)

Adjust simulated sun direction on the lidar hillshade. Azimuth = compass bearing of the light (0° north, 90° east). Altitude = height above the horizon (low = long shadows).

Historical map overlays

USGS scanned historical topographic maps. Enable an overlay and adjust its opacity. Works in 2D and 3D.

Sun azimuth: 315°   Sun altitude: 45°   Z factor: 1   Lidar opacity: 1
center: —   mouse: —   zoom: —

Topaz — Topaz Dome Quarry

Lost Treasure UT • Juab County County
Description
Legendary topaz collecting locality at Topaz Dome Quarry in Juab County (Public Access).
Historical Notes
Rockhounding.org documents this locality among 38 mapped United States topaz collecting sites (Public Access). Topaz (Al₂SiO₄(F,OH)₂) is Mohs hardness 8 with perfect basal cleavage and specific gravity 3.4–3.6 — noticeably heavier than quartz. Thomas Range quarry locality near Topaz Mountain producing topaz crystals from rhyolite cavities in western Utah. Utah designated topaz as the state gem in 1969. Thomas Range topaz crystallizes in Miocene rhyolite gas cavities — collectors work vugs for amber, sherry, and colorless crystals on BLM land with no permit fee at Topaz Mountain. Field ethics: verify land status, owner permission, and current regulations before collecting. Topaz cleaves easily — wrap specimens individually and avoid hammer blows on crystals. Coordinates from Rockhounding.org locality page. Access type: Public Access.
Status / Verification legend — Verified

Take Add Data / Take Notes

Log in or create an account to save private field notes for this location. Your notes are only visible to you.

Forgot password?
or

Enter your email and we'll send you a link to reset your password.

Back to log in
or